A tileset I made for C3 summer 2020, here's a desert that's an improvement from my 2018 one. This version in particular comes with additional SMB3-esque blocks, among other things. The quicksand is ExAnimated, and as you'd expect, does nothing - you'll need separate custom blocks for that.
The tileset is great but for whatever reason, the animated quicksand blocks are not showing up in my map16 at all. Its just blank tiles there. All the other tiles look and work as they should
You need to have the ExAnimation frames set correctly (brick block icon in Lunar Magic). The sample level has them all set up, so you can just copy all the animation slots from that level into your level.
There are a lot of assets here that it should never be boring to make a level with this nor play it. The sand is among the best I've seen in desert sets hosted on SMWC. The stone has pitting, blocks have textures that make me think of old Arabia, and those pillars with matching platforms are an excellent addition to create high-altitude areas. The default palette is deep and natural, though the plants, bones, and blocks can break it up for you if it's too earthy.